Solution : https://service.sap.com/sap/support/notes/516716 (SAP Service marketplace login required)
Key words : 
/usr/lib/gconv/gconv-modules, rpm -ivh <linuxlab-locales-rpm>, rpm -ivh <saplocales-rpm>, /usr/sap/<sid>/, symptom problems occur, textenv_invalid error message, linuxlab-localeseither install, operating system level, rpm relevant, linuxlab-locales
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